<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>路费</title>
        <style>
            p>i:first-child{
                color: blue;
            }
            p:first-child i{
                color: brown;
            }
            input:checked{
                
            }
        </style>
    </head>
    <body>
        <p>I am a <i>strong</i> man . iam a <i>strong</i> man.</p>
        <p>I am a <i>strong</i> man . iam a <i>strong</i> man.</p>
        <p><b>注意:</b> 当 :first-child 作用于 IE8 以及更早版本的浏览器, ！DOCTYPE 必须已经定义.</p>
        <div class="divs">
            <input type="checkbox" name="选择" id="choose" value="">诛仙
        </div>
        
    </body>
</html>